One-Way Clutch - Planetary (Low)

Fig 1: Identifying One-Way Clutch - Planetary (Low)

Courtesy of FORD MOTOR CO.

The planetary (low) one-way clutch is a roller clutch that holds the planetary gearset in first gear, D and D ranges. During automatic coasting downshifts into first gear (D and D ranges), the planetary one-way clutch freewheels so there is no engine braking.